JP2003332944A - Path selection circuit and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a path selection circuit and a method which can improve a reception performance by changing a minimum selection path range based on a delay profile or tracking information. <P>SOLUTION: The path selection circuit 100 includes a delay profile generator 101 for generating a delay profile that is a correlation value of every receiving phases, a minimum selection path interval decider 102 for deciding the minimum selection path interval, a path selector 103 for carrying out the path selection using the minimum selection path interval based on the generated delay profile. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a path selection circuit and method for performing multipath timing synchronization in a code division multiple access (hereinafter abbreviated as "CDMA") mobile communication system.

[0002]

2. Description of the Related Art In a CDMA mobile communication base station or mobile station, a delay profile is generated from a received signal and a pass service is generated.
The reception performance was different depending on the minimum selection path interval when the fingers were allocated and fingers were assigned. Conventionally, TECHNICAL REPOR
T OF IEICE. RCS97-164 (1997-11), The Institute of Electronics, Information and Communication Engineers (THE INSTITUTE OF ELECTRONIC
S, INFORMATION AND COMMUNICATION ENGINEERS)), "Paper search characteristics of DS-CDMA system by indoor / outdoor experiments" is described. In this paper, the result that the optimum value of the minimum selection path interval is 0.75 chip is shown.

[0003]

However, in selecting all paths, the optimum value of the minimum selected path interval is 0.7.
Since the number of chips is not necessarily 5 chips, there is a problem in that, for example, if the optimum value of the minimum selection path interval is fixed to 0.75 chips, the reception performance may deteriorate.

Specifically, as a first problem, as shown in FIG. 13, when the phase difference x between the first path and the second path is smaller than the minimum selection path interval r, the relationship of x <r is established. In this case, since the fingers cannot be assigned to the ideal phase for the second path, the reception performance deteriorates.

As a second problem, as shown in FIG. 14, when the skirt of the first path is larger than that of the second path (that is, y> 0), the fingers assigned to the skirt of the first path. Deteriorates the reception performance, and when the number of multipaths is larger than the number of fingers of the receiver, the effective path is missed and the reception performance deteriorates.

The present invention has been made in view of the above circumstances, and provides a path selection circuit and method capable of improving reception performance by changing the minimum selection path range based on a delay profile or tracking information. The purpose is to do.

[0007]

A path selection circuit according to the present invention comprises a delay profile generation means for generating a delay profile which is a correlation value for each reception phase, and a minimum selection path interval determination means for determining a minimum selection path interval. And a path selection unit that performs path selection using the minimum selection path interval based on the generated delay profile.

With this configuration, the minimum selection path interval can be changed based on the maximum correlation value of the delay profile, so that the receiving performance can be improved.

In the path selection circuit of the present invention, the minimum selected path interval determining means has a phase correlation r of a maximum correlation value of the delay profile and a phase difference r with respect to a phase p of the maximum correlation value of the delay profile. A configuration is adopted in which the minimum selection path interval is determined by using the ratio or the difference with the correlation value of the delay profile in the phase p-r.

With this configuration, the minimum selection path interval can be changed based on the maximum correlation value of the delay profile, so that the receiving performance can be improved.

In the path selection circuit of the present invention, the minimum selected path interval determining means determines the correlation value of the delay profile in the phase p (i) of the selected path and the phase p of the selected path.
A configuration is adopted in which the minimum selection path interval is determined by using the ratio or the difference with the correlation value of the delay profile in the phase p (i) + r and the phase p (i) -r that are the phase difference r with respect to (i). .

According to this structure, since the minimum selection path interval is determined based on the phases of all the already selected paths, the minimum selection path interval effective for all paths is determined not only by the maximum correlation value. Therefore, the reception performance can be improved.

In the path selection circuit of the present invention, the minimum selection path interval determining means determines the minimum selection path interval for each of the already selected paths.

According to this structure, the minimum selection path interval is determined for each finger based on the phase of the already selected path, so that the minimum selection path interval can be determined appropriately for each finger.

In the path selection circuit of the present invention, the minimum selection path interval determining means determines the minimum selection path interval for each of the positive side and the negative side of the phase of the already selected path.

According to this structure, since the minimum selection path interval is determined for each positive side and negative side of the phase of the already selected path for each finger, the minimum selection is appropriately performed for each finger and before and after the path phase. Since the path interval can be determined, reception performance can be improved.

In the path selection circuit of the present invention, the minimum selection path interval determining means determines the ratio or difference between the correlation value of the delay profile at the phase p (i) of the already selected path and the noise level obtained from the delay profile. Is smaller than the threshold value, an initial value is used as the minimum selected path interval of the already selected paths.

According to this structure, the minimum selected path interval is determined for each finger on the positive side and the negative side of the phase of the already selected path in consideration of the noise level. Since it is possible to appropriately determine the minimum selection path interval for each of the front and rear, reception performance can be improved.

In the path selection circuit of the present invention, the minimum selection path interval determining means uses a delay profile obtained by adding or averaging a plurality of delay profiles for a plurality of antennas.

According to this configuration, since the minimum selected path range is determined based on the delay profile obtained by combining the delay profiles of the respective antennas, the level of the path received by one antenna falls due to fading. And
When the other antenna is receiving at a sufficient level, the minimum selected path range can be appropriately determined regardless of fading fluctuation, so that the receiving performance can be improved.

In the path selection circuit of the present invention, the minimum selection path interval determining means is an ON-TIM used for tracking.
Correlation value of E phase p (i) and ON-TIME phase p
The LATE phase p (i) + having a phase difference r with respect to (i)
The minimum selected path interval is determined by using the ratio or the difference between the r and the EARLY phase p (i) -r with the correlation value used for tracking.

According to this structure, the tracking information (O
Since the minimum selection path range can be determined based on the N-TIME correlation value, the EARLY correlation value, and the LATE correlation value), the reception performance can be improved.

The mobile communication base station apparatus of the present invention has a configuration including the path selection circuit.

According to this structure, it is possible to obtain the mobile communication base station apparatus having the above effects.

The mobile communication terminal device of the present invention has a configuration including the path selection circuit.

According to this structure, it is possible to obtain a mobile communication terminal device having the above effects.

The mobile communication system of the present invention has a configuration including either the mobile communication base station apparatus or the mobile communication terminal apparatus.

According to this structure, it is possible to obtain a mobile communication system having the above effects.

The path selection method of the present invention comprises: a delay profile generation step of generating a delay profile which is a correlation value for each reception phase; a minimum selection path interval determination step of determining a minimum selection path interval; And a path selection step of performing path selection using the minimum selected path interval based on a delay profile.

According to this method, the minimum selection path interval can be changed based on the maximum correlation value of the delay profile, so that the receiving performance can be improved.

The path selection program of the present invention includes a delay profile generation step for generating a delay profile which is a correlation value for each reception phase, a minimum selection path interval determination step for determining a minimum selection path interval, and the generated delay. And a path selection step of performing path selection using the minimum selection path interval based on a profile.

According to this program, the minimum selection path interval can be changed based on the maximum correlation value of the delay profile, so that the receiving performance can be improved.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention is to change a minimum selection path range based on a delay profile or tracking information.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a path selection circuit according to Embodiment 1 of the present invention.

As shown in FIG. 1, the first embodiment of the present invention
The path selection circuit 100 according to (1) includes a delay profile generation unit 101, a minimum selection path interval determination unit 102, and a path selection unit 103.

The input terminal of the minimum selection path interval determination unit 102 is connected to the output terminal of the delay profile generation unit 101. The input terminals of the path selection unit 103 are the delay profile generation unit 101 and the minimum selection path interval determination unit 102.
Is connected to the output terminal of. The output terminal of the path selection unit 103 is connected to the input terminal of the finger unit 104.

The delay profile generator 101 receives the received signal 111, generates a delay profile 112 which is a correlation value for each reception phase, and determines a minimum selected path interval determiner 102.
And the path selection unit 103. The minimum selection path interval determination unit 102 determines r_f (1) which is the minimum selection path interval 113-1 and r_r (1) which is the minimum selection path interval 113-2 based on the delay profile 112, and the path selection unit 103. Give to.

The path selection unit 103 uses the delay profile 1
Based on 12, the minimum selection path intervals 113-1 and 113-
2 is used to perform path selection, and the path phase 114 is output to the finger unit 104.

Next, the determination of the minimum selected path interval r_f (1) and the minimum selected path interval r_r (1) by the minimum selected path interval determination unit 102 will be described with reference to the drawings.

The minimum selection path interval determination unit 102 uses the phase p
The correlation value a (1) of the first pass existing in (1) and r [chip (chip)] before the first pass, that is, the correlation value a_f (1) of the phase p (1) -r and after the first pass Of r [chips], that is, the correlation value a_r (1) of the phase p (1) + r is used to determine the minimum selection path interval.

First, the minimum selection path interval determination unit 102
Assuming that the phase difference x between the first path and the second path is smaller than the minimum selected path interval r as shown in FIG. 2, r_f (1) and r_r (1) are updated as follows.

The minimum selected path interval determination unit 102 obtains d_f (1) and d_r (1), which are the differences between the correlation values, by the following (Equation 1) and (Equation 2).

[0044]

[Equation 1]

[Equation 2] Next, d_f (1) is compared with the threshold value th_upper, and r_f (1) is updated as shown in (Equation 3) below. It should be noted that Δr represents a step of switching the minimum selection path interval. For example, when r = 3/4 [chips], Δr =
It may be 1/4 [chip].

[0045]

[Equation 3] Similarly, d_r (1) is compared with the threshold value th_upper, and r_r (1) is updated as shown in the following (Equation 4).

[0046]

[Equation 4] Next, as shown in FIG. 3, the correlation value a_f at the tail of the first pass
Assuming that (1) or a_r (1) is larger than the correlation value a (2) of the second pass, r_f (1) is calculated as follows.
And r_r (1) are updated.

For the results obtained by (Equation 1) and (Equation 2), d_f (1) is compared with the threshold value th_lower, and r_f (1) is updated as shown in the following (Equation 5). .

[0048]

[Equation 5] Similarly, d_r (1) is compared with the threshold value th_lower, and r_r (1) is updated as shown in the following (Equation 6).

[0049]

[Equation 6] Here, (Equation 3) and (Equation 5) are combined into the following (Equation 7), and (Equation 4) and (Equation 6) are combined into the following (Equation 8).

[0050]

[Equation 7]

[Equation 8] As described above, according to the first embodiment of the present invention, by adaptively changing the minimum selection path interval, it is possible to always select the optimum minimum selection path interval and improve the reception performance.

Next, the operation of the minimum selection path interval determination unit 102 will be described with reference to the drawings. FIG. 4 is a flow chart for explaining the operation of the minimum selection path interval determination unit 102.
It is a chart.

In step ST401, the minimum selection path interval determination unit 102 searches the delay profile 112 for the maximum correlation value and sets the maximum correlation value to a (1).
For the phase p (1) of the maximum correlation value, d_f (1) and d_r (1) are obtained by (Equation 1) and (Equation 2) and compared with the threshold th_upper (step ST40).
2), if both d_f (1) and d_r (1) are less than or equal to the threshold value th_upper, step ST4
R_f (1) and r_r (1) in r-Δr
To update.

In step ST402, d_f
(1) and d_r (1) are both thresholds th_upp
If it is not less than er, in step ST404, d_f (1) and d_r (1) are set to the threshold value th_l.
If both d_f (1) and d_r (1) are greater than or equal to the threshold value th_lower as compared with power, r_f (1) and r_r in step ST405.
(1) is updated to r + Δr.

In step ST404, d_f
(1) and d_r (1) are both threshold th_low
If not greater than or equal to er, in step ST406,
Let r_f (1) and r_r (1) be r. The minimum selection path interval determination unit 102 performs the above process and outputs r_f (1) which is the minimum selection path interval 113-1 and r_r (1) which is the minimum selection path interval 113-2.

In the first embodiment of the present invention, the minimum selection path interval determination unit 102 causes the phase having a phase difference r with respect to the maximum correlation value of the delay profile and the phase p of the maximum correlation value of the delay profile. The minimum selected path interval may be determined using the ratio of the correlation value of the delay profile at p + r and the phase p-r.

As described above, according to the first embodiment of the present invention, the minimum selection path interval can be changed based on the maximum correlation value of the delay profile, so that the reception performance can be improved.

(Second Embodiment) Next, a second embodiment of the present invention will be described in detail with reference to the drawings. Figure 5
FIG. 6 is a block diagram showing a configuration of a path selection circuit according to a second embodiment of the present invention. In the second embodiment of the present invention, the same components as those in the first embodiment of the present invention are designated by the same reference numerals.

As shown in FIG. 5, the second embodiment of the present invention
The path selection circuit 500 according to the first embodiment includes a delay profile generation unit 101, a minimum selection path interval determination unit 102, and a path selection unit 1.
03 and the selected path phase storage unit 501.
That is, the path selection circuit 5 according to the second embodiment of the present invention
00 is the path selection circuit 10 according to the first embodiment of the present invention.
0, an already-selected path phase storage unit 501 is added.

The input terminal of the already-selected path phase storage unit 501 is connected to the output terminal of the path selection unit 103. The output terminal of the already-selected path phase storage unit 501 is connected to the input terminal of the minimum selection path interval determination unit 102. The path selection circuit 500 uses the already-selected path phase 511 stored in the already-selected path phase storage unit 501 in the minimum-selected-path-interval determining unit 102 so that not the maximum path but the phase already assigned to the finger. The minimum selection path interval is determined based on

Next, the operation of the minimum selection path interval determination unit 102 will be described with reference to the drawings. FIG. 6 is a flow chart for explaining the operation of the minimum selection path interval determination unit 102.
It is a chart.

In step ST601, the minimum selected path interval determination unit 102 acquires the already selected path phase 511. For the selected path phases 511 corresponding to the number of fingers, d_
Let f (i) and d_r (i) be threshold values th_upper
(Step ST602), d_f (i) and d_r (i) are both threshold values th for all fingers.
If it is less than or equal to _upper, step ST603.
At r, r_f (1) and r_r (1) are updated to r-Δr.

In step ST602, if it is not established that both d_f (i) and d_r (i) are less than or equal to the threshold value th_upper for all fingers, in step ST604, d_f (i) and d_f (i) and d_f (i) are not exceeded.
_R (i) is compared with the threshold value th_lower, and if d_f (i) and d_r (i) are both equal to or greater than the threshold value th_lower for all fingers, then in step ST605, r_f (1) and r_r (1). ) Is updated to r + Δr.

In step ST604, if it is not satisfied that both d_f (i) and d_r (i) are equal to or more than the threshold value th_lower for all fingers, in step ST606 r_f (1) and r_f (1).
Let r (1) be r. Minimum selection path interval determination unit 102
Performs the above process and outputs r_f (1) which is the minimum selection path interval 113-1 and r_r (1) which is the minimum selection path interval 113-2.

In the second embodiment of the present invention, the minimum selected path interval determination unit 102 uses the phase p of the already selected paths.
The correlation value of the delay profile in (i) and the phase p (i) that is the phase difference r with respect to the phase p (i) of the selected path.
The minimum selection path interval may be determined using the ratio of + r and the correlation value of the delay profile at the phase p (i) -r.

As described above, according to the second embodiment of the present invention, the minimum selected path interval is determined on the basis of the phases of all the already selected paths. Since the effective minimum selection path interval can be determined, the reception performance can be improved.

(Third Embodiment) Next, a third embodiment of the present invention will be described in detail with reference to the drawings. Figure 7
FIG. 9 is a block diagram showing a configuration of a path selection circuit according to a third embodiment of the present invention. In the third embodiment of the present invention, the same components as those in the second embodiment of the present invention are designated by the same reference numerals.

As shown in FIG. 7, the third embodiment of the present invention.
The path selection circuit 700 according to FIG.
03 and the selected path phase storage unit 501.
That is, the path selection circuit 7 according to the third embodiment of the present invention
00 is the path selection circuit 50 according to the second embodiment of the present invention.
0 has the same components. The path selection circuit 700 according to the third embodiment of the present invention includes a minimum selection path interval determination unit 10
2 differs from the path selection circuit 500 according to the second embodiment of the present invention only in that the number of fingers is N.

Next, the operation of the minimum selection path interval determination unit 102 will be described with reference to the drawings. FIG. 8 is a flow chart for explaining the operation of the minimum selection path interval determination unit 102.
It is a chart.

In step ST801, the minimum selected path interval determination unit 102 acquires the already selected path phase 511. Thresholds th_up for d_f (i) and d_r (i) for the selected path phase 511 for finger i.
Compared with per (step ST802), d_f
(I) and d_r (i) are both thresholds th_upp
When it is less than or equal to er, in step ST803, r_f (i) and r_r (i) are updated to r-Δr.

At step ST802, the finger i
If it is not established that both d_f (i) and d_r (i) are equal to or less than the threshold value th_upper in step ST804, in step ST804, d_f (i) and d_f (i)
If _r (i) is compared with the threshold th_lower and both d_f (i) and d_r (i) for the finger i are equal to or greater than the threshold th_lower, then in step ST805, r_f (i) and r_r (i). ) Is updated to r + Δr.

At step ST804, the finger i
If it is not established that both d_f (i) and d_r (i) are greater than or equal to the threshold value th_lower, then in step ST806, r_f (i) and r_f
Let r (i) be r. Minimum selection path interval determination unit 102
Performs the above process N times as many times as the number of fingers, and outputs r_f (i) that is the minimum selection path interval 113-i-1 and r_r (i) that is the minimum selection path interval 113-i-2 for the number of fingers.

As described above, according to the third embodiment of the present invention, since the minimum selection path interval is determined for each finger based on the phase of the already selected path, the minimum selection path interval is appropriately determined for each finger. Therefore, it is possible to improve the reception performance.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings. Figure 7
FIG. 9 is a block diagram showing a configuration of a path selection circuit according to a fourth embodiment of the present invention. In the fourth embodiment of the present invention, the same components as those in the third embodiment of the present invention are designated by the same reference numerals. As shown in FIG. 7, the path selection circuit 700 according to the third embodiment of the present invention includes a delay profile generation unit 101, a minimum selection path interval determination unit 102, a path selection unit 103, and an already-selected path phase storage unit 501. is doing. Path selection circuit 70 according to Embodiment 4 of the present invention
0 is different from the path selection circuit 700 according to the third embodiment of the present invention only in the operation of the minimum selection path interval determination unit 10.

Next, the operation of the minimum selection path interval determination unit 102 will be described with reference to the drawings. FIG. 9 is a flow chart for explaining the operation of the minimum selection path interval determination unit 102.
It is a chart.

In step ST901, the minimum selected path interval determination unit 102 acquires the already selected path phase 511. D_f (i) is compared with the threshold th_upper for the selected path phase 511 for finger i (step ST902), and d_f (i) is equal to the threshold th.
If it is less than or equal to _upper, step ST903.
In, r_f (i) is updated to r-Δr. Next, in step ST904, d_r (i) is set to the threshold value th.
D_r (i) is a threshold value th_ compared to _upper
If it is equal to or lower than upper, r_r (i) is updated to r-Δr in step ST905.

In step ST902, d_f (i)
Is not less than or equal to the threshold th_upper, in step ST906, d_f (i) is equal to the threshold th_upper.
It is determined whether it is lower or higher. Step ST90
If d_f (i) is greater than or equal to the threshold value th_lower in step 6, r_f in step ST907.
Update (i) to r + Δr. If d_f (i) is not greater than or equal to the threshold value th_lower in step ST906, r_f (i) in step ST908.
Be r.

In step ST904, d_r (i)
Is not less than or equal to the threshold th_upper, in step ST909 d_r (i) is equal to the threshold th_upper.
It is determined whether it is lower or higher. Step ST90
If d_r (i) is greater than or equal to the threshold value th_lower in step 9, r_r in step ST910.
Update (i) to r + Δr. If d_r (i) is not greater than or equal to the threshold value th_lower in step ST909, r_r (i) in step ST911.
Be r. The minimum selection path interval determination unit 102 performs the above processing N times the number of fingers to obtain the minimum selection path interval 113-
i−1, r_f (i) and minimum selection path interval 113
Output r_r (i) that is −i−2 for the number of fingers.

As described above, according to the fourth embodiment of the present invention, the minimum selected path interval is determined for each finger on the positive side and the negative side of the phase of the already selected path. Since the minimum selection path interval can be appropriately determined before and after the phase, the reception performance can be improved.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings. Figure 7
FIG. 9 is a block diagram showing a configuration of a path selection circuit according to a fifth embodiment of the present invention. In the fifth embodiment of the present invention, the same components as those in the third embodiment of the present invention are designated by the same reference numerals. As shown in FIG. 7, the path selection circuit 700 according to the fifth embodiment of the present invention includes a delay profile generation unit 101, a minimum selection path interval determination unit 102, a path selection unit 103, and an already-selected path phase storage unit 501. is doing. The path selection circuit 70 according to the fifth embodiment of the present invention.
0 is different from the path selection circuit 700 according to the fourth embodiment of the present invention only in the operation of the minimum selection path interval determination unit 10.

Next, the operation of the minimum selection path interval determination unit 102 will be described with reference to the drawings. FIG. 10 is a flow chart for explaining the operation of the minimum selection path interval determination unit 102.

In step ST1001, the minimum selected path interval determination unit 102 acquires the already selected path phase 511. Next, in step ST1002, the minimum selection path interval determination unit 102 determines the threshold value th_noise based on the noise level from the delay profile. Next, in step ST1003, it is determined whether the correlation value a (i) for the finger i is greater than or equal to the threshold value th_noise.

In step ST1003, the correlation value a (i) for finger i is the threshold value th_nois.
If it is equal to or larger than e, the processes of steps ST902 to ST911 are performed similarly to the fourth embodiment of the present invention to r_f.
Determine (i) and r_r (i). Step ST10
In 03, if the correlation value a (i) for the finger i is not greater than or equal to the threshold value th_noise, in step ST1004 r_f (i) = r_r (i) =
Let r. The minimum selection path interval determination unit 102 performs the above processing N times the number of fingers to obtain the minimum selection path interval 113-i.
R_f (i) which is -1 and the minimum selection path interval 113-
Output r_r (i) that is i-2 for the number of fingers.

In the fifth embodiment of the present invention, the minimum selected path interval determination unit 102 determines the phase p of the already selected path.
When the ratio between the correlation value of the delay profile in (i) and the noise level obtained from the delay profile is smaller than the threshold value, an initial value may be used as the minimum selected path interval of the already selected paths. .

As described above, according to the fifth embodiment of the present invention, the minimum selected path interval is determined for each finger on the positive side and the negative side of the phase of the already selected path in consideration of the noise level. Therefore, it is possible to appropriately determine the minimum selected path interval for each finger and before and after the path phase, so that it is possible to improve the reception performance.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described in detail with reference to the drawings. Figure 11
FIG. 16 is a block diagram showing a configuration of a path selection circuit according to a sixth embodiment of the present invention. In the sixth embodiment of the present invention, the same components as those of the third embodiment of the present invention are designated by the same reference numerals.

As shown in FIG. 11, the path selection circuit 1100 according to the sixth embodiment of the present invention has two delay profile generation sections 1101-1 and 1101-2, a delay profile synthesis section 1102, and a minimum selected path interval determination. Part 102,
A path selection unit 103 and an already-selected path phase storage unit 501 are provided. The input terminals of the delay profile synthesis unit 1102 are the delay profile generation units 1101-1 and 1101.
-2 is connected to the output terminal. The output terminal of the delay profile synthesis unit 1102 is the minimum selection path interval determination unit 1
02 and the input terminal of the path selection unit 103.

The path selection circuit 1100 according to the sixth embodiment of the present invention is different from the third embodiment of the present invention in that the delay profiles generated for each antenna are combined.

Next, the operation of the path selection circuit 1100 according to the sixth embodiment of the present invention, which is different from the third embodiment of the present invention, will be described.

Delay profile generators 1101-1, 1
Reference numerals 101-2 denote the first antenna reception signal 111, respectively.
The first and second antenna reception signals 1112 are received and delay profiles 1113 and 1114 are generated. The delay profile synthesis unit 1102 includes a delay profile generation unit 11
Delay profile 11 from 01-1, 1101-2
13, 1114 are received and combined to generate a combined delay profile 1115. The minimum selection path range 102 is the minimum selection path range r_ based on the combined delay profile 1115.
Determine f (i) and r_r (i).

As described above, according to the sixth embodiment of the present invention, since the minimum selected path range is determined based on the delay profile obtained by combining the delay profiles of the respective antennas, the signal is received by one antenna. The pass level is
When it is depressed due to aging and the other antenna is receiving at a sufficient level, it is possible to appropriately determine the minimum selected path range regardless of fading fluctuation, and therefore it is possible to improve reception performance. .

In Embodiments 1 to 6 of the present invention, minimum selection path interval determining section 102 may use a delay profile obtained by adding or averaging a plurality of delay profiles for a plurality of antennas.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described in detail with reference to the drawings. 12
FIG. 14 is a block diagram showing a configuration of a path selection circuit according to a seventh embodiment of the present invention. In the seventh embodiment of the present invention, the same components as those in the second embodiment of the present invention are designated by the same reference numerals.

As shown in FIG. 12, the path selection circuit 1200 according to the seventh embodiment of the present invention includes a delay profile generation section 101, a minimum selection path interval determination section 102, a path selection section 103 and a tracking information storage section 1201. It has. That is, the path selection circuit 1200 according to the seventh embodiment of the present invention has the tracking information storage unit 1201 instead of the already-selected path phase storage unit 501 in the path selection circuit 500 according to the second embodiment of the present invention. There is.

The input terminal of the tracking information storage section 1201 is connected to the output terminal of the finger section 104.
The output terminal of the tracking information storage unit 1201 is connected to the input terminal of the minimum selection path interval determination unit 102.
The tracking information storage unit 1201 includes a finger unit 104.
Finger tracking information (ON-TI
ME correlation value, EARLY correlation value and LATE correlation value) 7
11 is stored.

Next, the operation of the path selection circuit 1700 according to the seventh embodiment of the present invention, which is different from the second embodiment of the present invention, will be described.

The minimum selected path interval determination unit 102 receives the tracking information (O) from the tracking information storage unit 1201.
The minimum selected path interval 113-1 based on the N-TIME correlation value, the EARLY correlation value and the LATE correlation value r
_F (1) and the minimum selection path interval 113-2 r_
r (1) is determined and given to the path selection unit 103. In this case, the minimum selection path interval determination unit 102 determines that the ON-TIM
Let the E correlation value be a (i) and the EARLY correlation value be a_f.
(I), and the LATE correlation value is set to a_r (i), and the arithmetic processing is performed.

As described above, according to the seventh embodiment of the present invention, tracking information (ON-TIME correlation value, E
Since the minimum selected path range can be determined based on the ARLY correlation value and the LATE correlation value), the reception performance can be improved.

The present invention can be applied to a mobile communication base station apparatus, mobile communication terminal apparatus or mobile communication system.

[0099]

As described above, according to the present invention,
The reception performance can be improved by changing the minimum selection path range based on the delay profile or the tracking information.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a path selection circuit according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the path selection circuit according to the first embodiment of the present invention.

FIG. 3 is a diagram for explaining another operation of the path selection circuit according to the first embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of the path selection circuit according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a path selection circuit according to a second embodiment of the present invention.

FIG. 6 is a flowchart for explaining the operation of the path selection circuit according to the second embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a path selection circuit according to third, fourth and fifth embodiments of the present invention.

FIG. 8 is a flowchart for explaining the operation of the path selection circuit according to the third embodiment of the present invention.

FIG. 9 is a flowchart for explaining the operation of the path selection circuit according to the fourth embodiment of the present invention.

FIG. 10 is a flowchart for explaining the operation of the path selection circuit according to the fifth embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a path selection circuit according to a sixth embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of a path selection circuit according to a seventh embodiment of the present invention.

FIG. 13 is a diagram for explaining the operation of a conventional path selection circuit.

FIG. 14 is a diagram for explaining another operation of the conventional path selection circuit.

[Explanation of symbols]

100, 500, 700, 1100, 1200 Path selection circuit 101 Delay profile generation section 102 Minimum selected path interval determination section 103 Path selection section 104 Finger section 501 Selected path phase storage section 1101-1, 1101-2 Delay profile generation section 1102 Delay profile synthesis unit 1201 Tracking information storage unit

Claims (13)

[Claims] 1. A delay profile generation unit that generates a delay profile that is a correlation value for each reception phase, a minimum selection path interval determination unit that determines a minimum selection path interval, and the delay profile generation unit based on the generated delay profile. A path selection circuit comprising path selection means for performing path selection using a minimum selection path interval. 2. The minimum selected path interval determining means has a phase p that is a phase difference r with respect to a phase p of a maximum correlation value of the delay profile and a maximum correlation value of the delay profile.
The path selection circuit according to claim 1, wherein the minimum selection path interval is determined by using a ratio or a difference between the correlation value of the delay profile at + r and the phase p-r. 3. The minimum selected path interval determining means is a phase difference r with respect to the correlation value of the delay profile at the phase p (i) of the already selected path and the phase p (i) of the already selected path.
The path according to claim 1, wherein the minimum selected path interval is determined by using a ratio or a difference between a correlation value of a delay profile in the phase p (i) + r and a phase p (i) -r. Selection circuit. 4. The path selection circuit according to claim 3, wherein the minimum selection path interval determination means determines the minimum selection path interval for each of the already selected paths. 5. The path selection circuit according to claim 3, wherein the minimum selected path interval determination means determines the minimum selected path interval for each of the positive side and the negative side of the phase of the already selected path. 6. The minimum selected path interval determining means has a ratio or difference between a correlation value of a delay profile at a phase p (i) of the already selected path and a noise level obtained from the delay profile is smaller than a threshold value. In this case, the path selection circuit according to claim 3, wherein an initial value is used as the minimum selected path interval of the already selected paths. 7. The minimum selection path interval determination means uses a delay profile obtained by adding or averaging a plurality of delay profiles for a plurality of antennas.
7. The path selection circuit according to claim 6. 8. The minimum selected path interval determination means is a correlation value of an ON-TIME phase p (i) used for tracking, and a LATE phase p (which is a phase difference r with respect to the ON-TIME phase p (i). i) + r and EARLY phase p
The path selection circuit according to claim 1, wherein the minimum selected path interval is determined by using a ratio or a difference with a correlation value used for tracking in (i) -r. 9. A mobile communication base station apparatus comprising the path selection circuit according to any one of claims 1 to 8. 10. A mobile communication terminal apparatus comprising the path selection circuit according to claim 1. Description: 11. A mobile communication system comprising one of the mobile communication base station device according to claim 9 and the mobile communication terminal device according to claim 10. 12. A delay profile generation step of generating a delay profile which is a correlation value for each reception phase, a minimum selection path interval determination step of determining a minimum selection path interval, and the delay profile generation step based on the generated delay profile. And a path selecting step of performing path selection using a minimum selected path interval. 13. A delay profile generation step of generating a delay profile which is a correlation value for each reception phase, a minimum selection path interval determination step of determining a minimum selection path interval, and the minimum based on the generated delay profile. A path selection program for performing a path selection step of performing path selection using a selected path interval.